Electrons (charge -q) are emitted from a thermionic filament and, after passing through a series of lenses, produces a 7 mm diameter beam. The electron's velocity is 83% of the speed of light and the beam current is 80 mA. What is the electron density in the beam ? Give your answer in units of 103 m Answer can be entered up to 3 decimal places. Correct answers must be within 15 %. Useful data: q=1.6 x 10-19 C c=3 x 10% m/s n- 3.142
Electrons (charge -q) are emitted from a thermionic filament and, after passing through a series of lenses, produces a 7 mm diameter beam. The electron's velocity is 83% of the speed of light and the beam current is 80 mA. What is the electron density in the beam ? Give your answer in units of 103 m Answer can be entered up to 3 decimal places. Correct answers must be within 15 %. Useful data: q=1.6 x 10-19 C c=3 x 10% m/s n- 3.142
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Transcribed Image Text:Electrons (charge -q) are emitted from a thermionic filament and, after passing through a series of lenses, produces a 7
mm diameter beam. The electron's velocity is 83% of the speed of light and the beam current is 80 mA.
What is the electron density in the beam ? Give your answer in units of 103 m
Answer can be entered up to 3 decimal places. Correct answers must be within 15 %.
Useful data;
q= 1.6 x 10-19 C
c=3 x 10% m/s
n- 3.142
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